Ambipolar phosphorene field effect transistor

Saptarshi Das, Marcel Demarteau, Andreas Roelofs

Research output: Contribution to journalArticle

242 Scopus citations

Abstract

In this article, we demonstrate enhanced electron and hole transport in few-layer phosphorene field effect transistors (FETs) using titanium as the source/drain contact electrode and 20 nm SiO 2 as the back gate dielectric. The field effect mobility values were extracted to be ∼38 cm 2 /Vs for electrons and ∼172 cm 2 /Vs for the holes. On the basis of our experimental data, we also comprehensively discuss how the contact resistances arising due to the Schottky barriers at the source and the drain end effect the different regime of the device characteristics and ultimately limit the ON state performance. We also propose and implement a novel technique for extracting the transport gap as well as the Schottky barrier height at the metal - phosphorene contact interface from the ambipolar transfer characteristics of the phosphorene FETs. This robust technique is applicable to any ultrathin body semiconductor which demonstrates symmetric ambipolar conduction. Finally, we demonstrate a high gain, high noise margin, chemical doping free, and fully complementary logic inverter based on ambipolar phosphorene FETs.

Original languageEnglish (US)
Pages (from-to)11730-11738
Number of pages9
JournalACS nano
Volume8
Issue number11
DOIs
StatePublished - Nov 25 2014

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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    Das, S., Demarteau, M., & Roelofs, A. (2014). Ambipolar phosphorene field effect transistor. ACS nano, 8(11), 11730-11738. https://doi.org/10.1021/nn505868h